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It sounds like you you've done everything but the simplest one of all. For my '86 240DL, I bought a can of BG44k fuel system cleaner because of rough idle and high emissions output. A few threads on brickboard recommended this cleaner above all others for Volvos so I figured I'd give it a try. It really smoothed out my rough idle. I bought mine at a Goodyear/Gemini service center in Atlanta. Hard to find, but worth it! It doesnt sell retail so you gotta call around to auto centers. Dont waste your time with pepboys, Napa, or anything else like that, they wont have it.
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